乌里雅斯太凹陷南洼槽下白垩统储集性能影响因素分析及其油气地质意义  

Influence Factor Analysis of Lower Cretaceous Reservoir and Its Hydrocarbon Geological Significance in Southern Sag of Wuliyasitai Depression

作　　者：陈亦寒[1] 杨德相[2] 李振远[3] 张光扬[3] 苏燕 

机构地区：[1]中国石油大学(北京)地球物理与信息工程学院,北京102249 [2]中石油华北油田分公司勘探开发研究院,河北任丘062552 [3]辽河油田海南油气勘探分公司,辽宁盘锦124010 [4]中石化西南分公司勘探开发研究院,四川成都610081

出　　处：《石油天然气学报》2011年第9期17-22,164-165,共6页Journal of Oil and Gas Technology

基　　金：国家科技重大专项(2008ZX05010-002)

摘　　要：利用薄片、图像分析、扫描电镜和岩石物性等分析手段，对二连盆地马尼特坳陷东北端乌里雅斯太凹陷南洼槽下白垩统砂岩储层进行研究，分析了储层沉积成岩作用特征，划分了孔隙类型，主要包括粒间孔、溶孔和晶间孔。探讨了孔隙度和渗透率与埋藏深度的关系，整体上看，随着埋藏深度的增加孔隙度和渗透率逐渐减小，但在1400-2400m深度段，孔隙度和渗透率具有明显的回返增大现象。孔渗性能的这种演化趋势受沉积和成岩两方面的因素影响，沉积主要对储层的原始物性起决定性作用，而成岩作用对现今物性影响较大。研究表明，有利的沉积相带，如扇三角洲前缘分支水道前缘楔状砂、湖底扇内扇主沟道和中扇辫状沟道等，是乌里雅斯太凹陷南洼槽碎屑岩储层油气成藏的基础；而次生孔隙发育带是乌里雅斯太凹陷南洼槽碎屑岩储层最有利的油气成藏带。By means of thin section,image analysis,scanning electron microscope and X-Ray diffraction,Lower Cretaceous sandstone reservoir in Wuliyasitai Depression of Erlian Basin was studied.The reservoir sedimentation and diagenesis were analyzed,pore types including intergranular pore,dissolved pore and intercrystal pore were classified,and the relationship between porosity,permeability and buried depth was researched.As a whole,the porosity and permeability are reduced along with the depth increasing,but at 1400 to 2400m,the porosity and permeability are raised obviously.This pore evolvement trend is influenced by both sedimentation and diagenesis.Sedimentation has an effect on reservoir physical property,while diagenesis has the effect on current reservoir physical property.Investigations indicate that the advantageous sedimentary facies such as fan delta and sublacustrine fan are the foundation of reservoir formation in Wuliyasitai Depression,and the secondary pore development zones are the beneficial areas of reservoir forming zones.

关 键 词：碎屑岩 沉积相 成岩作用 储集性能 下白垩统 乌里雅斯太凹陷 

分 类 号：P618.13[天文地球—矿床学]